1// Copyright 2011 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#include "v8.h"
29
30#include "ast.h"
31#include "func-name-inferrer.h"
32#include "list-inl.h"
33
34namespace v8 {
35namespace internal {
36
37FuncNameInferrer::FuncNameInferrer(Isolate* isolate)
38    : isolate_(isolate),
39      entries_stack_(10),
40      names_stack_(5),
41      funcs_to_infer_(4) {
42}
43
44
45void FuncNameInferrer::PushEnclosingName(Handle<String> name) {
46  // Enclosing name is a name of a constructor function. To check
47  // that it is really a constructor, we check that it is not empty
48  // and starts with a capital letter.
49  if (name->length() > 0 && Runtime::IsUpperCaseChar(
50          isolate()->runtime_state(), name->Get(0))) {
51    names_stack_.Add(Name(name, kEnclosingConstructorName));
52  }
53}
54
55
56void FuncNameInferrer::PushLiteralName(Handle<String> name) {
57  if (IsOpen() && !isolate()->heap()->prototype_symbol()->Equals(*name)) {
58    names_stack_.Add(Name(name, kLiteralName));
59  }
60}
61
62
63void FuncNameInferrer::PushVariableName(Handle<String> name) {
64  if (IsOpen() && !isolate()->heap()->result_symbol()->Equals(*name)) {
65    names_stack_.Add(Name(name, kVariableName));
66  }
67}
68
69
70Handle<String> FuncNameInferrer::MakeNameFromStack() {
71  return MakeNameFromStackHelper(0, isolate()->factory()->empty_string());
72}
73
74
75Handle<String> FuncNameInferrer::MakeNameFromStackHelper(int pos,
76                                                         Handle<String> prev) {
77  if (pos >= names_stack_.length()) return prev;
78  if (pos < names_stack_.length() - 1 &&
79      names_stack_.at(pos).type == kVariableName &&
80      names_stack_.at(pos + 1).type == kVariableName) {
81    // Skip consecutive variable declarations.
82    return MakeNameFromStackHelper(pos + 1, prev);
83  } else {
84    if (prev->length() > 0) {
85      Factory* factory = isolate()->factory();
86      Handle<String> curr = factory->NewConsString(
87          factory->dot_symbol(), names_stack_.at(pos).name);
88      return MakeNameFromStackHelper(pos + 1,
89                                     factory->NewConsString(prev, curr));
90    } else {
91      return MakeNameFromStackHelper(pos + 1, names_stack_.at(pos).name);
92    }
93  }
94}
95
96
97void FuncNameInferrer::InferFunctionsNames() {
98  Handle<String> func_name = MakeNameFromStack();
99  for (int i = 0; i < funcs_to_infer_.length(); ++i) {
100    funcs_to_infer_[i]->set_inferred_name(func_name);
101  }
102  funcs_to_infer_.Rewind(0);
103}
104
105
106} }  // namespace v8::internal
107